sed匹配两种重要思想

1,sed匹配两种重要思想

屏蔽思想:遮住不想要的

挑出思想:遮住所有,挑出想要的.

2,实例

屏蔽思想:

[[email protected] ~]# sed -n ‘2p‘ file.txt |sed -r ‘s#fox##g‘
[email protected]

全匹配,挑出思想:

2.1

问题:echo "I am lanny teacher"过滤lanny.

[[email protected] ~]# echo "I am lanny teacher"|sed -r ‘s#^.*am ([a-z].*) te.*$#\1#g‘
lanny

2.2

问题:echo "[email protected]"过滤foxmail.

[[email protected] ~]# echo "[email protected]"|sed -r ‘s#^.*@([a-z].*)\..*$#\1#g‘
foxmail